The cxx component re-injects its own archive late on the link line so its
stack-unwind wrappers take precedence over libgcc's (when C++ exceptions
are disabled). It does this through an INTERFACE helper, libgcc_cxx, that
carries `$<TARGET_FILE:${cxx}>`. That helper was linked back into the cxx
target with PUBLIC, which places it in the cxx archive's own
LINK_LIBRARIES, so the cxx target ends up transitively referencing its
own output file.
When CMake computes the cxx target's sources it walks the target's own
link implementation, encounters `$<TARGET_FILE:${cxx}>`, and to resolve the
file it needs the target's link language, which in turn needs its
sources. This loop makes generation fail with:
The SOURCES of "..." use a generator expression that depends on the
SOURCES themselves.
CMake only hits this when it reaches the cxx target standalone before the
target has been pulled into a link by a consumer, and whether that
happens depends on the project layout and target evaluation order. That
is why it surfaces only in some projects, while the examples build fine.
Link libgcc_cxx as INTERFACE instead of PUBLIC. A static archive is not
linked, so its private LINK_LIBRARIES are inert; consumers still receive
libgcc_cxx through INTERFACE_LINK_LIBRARIES, so the intended link order is
preserved. Removing the self-reference makes generation independent of
evaluation order.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
Skip processing cxx/project_include.cmake when building subprojects such
as ULP as they use custom toolchain and IDF toolchain helpers are not
available.
libstdc++ selects between a lock-free and a mutex-based policy for
std::shared_ptr reference counting based on this macro. Enabling this
option forces the lock-free policy, which avoids pulling in the
mutex-based implementation and can reduce code size.
Note: the lock-free policy avoids embedding a mutex in each control
block, saving about 88 bytes per shared_ptr, and improves performance
by using atomic operations instead of mutex locking.
Note: this option changes the ABI of libstdc++ atomic/shared_ptr
helpers. It can be incompatible when linking against prebuilt
libraries that were compiled without it, leading to link errors or
undefined runtime behavior. Only enable it if all C++ objects and
libraries in the build use the same setting.
* Also fixed setting the C++ exception emergency pool size
correctly when C++ exceptions are disabled:
__cxx_eh_arena_size_get() is now called again even if
CONFIG_COMPILER_CXX_EXCEPTIONS=n
This commit replaces the use of portNUM_PROCESSORS and configNUM_CORES
macros in all of ESP-IDF. These macros are needed to realize an SMP
scenario by fetching the number of active cores FreeRTOS is running on.
Instead, a new Kconfig option, CONFIG_FREERTOS_NUMBER_OF_CORES, has been
added as a proxy for the FreeRTOS config option, configNUMBER_OF_CORES.
This new commit is now used to realize an SMP scenario in various places
in ESP-IDF.
[Sudeep Mohanty: Added new Kconfig option CONFIG_FREERTOS_NUMBER_OF_CORES]
Signed-off-by: Sudeep Mohanty <sudeep.mohanty@espressif.com>
* All components which won't build (yet) on Linux are excluded.
This enables switching to Linux in an application without
explicitly setting COMPONENTS to main in the main
CMakeLists.txt.
* ESP Timer provides headers for Linux now
* automatically disabling LWIP in Kconfig if it is not available
doc(linux): brought section
"Component Linux/Mock Support Overview" up to date
Merges https://github.com/espressif/esp-idf/pull/12093
fix(ll): remove FLAG_ATTR macro
Such kind of operator overload will not work because C++ thinks such overload is ambiguous and it still prefer the built-in one which accepts and returns integer. Manually force type conversion seems to be unavoidable.
This function removes the following legacy atomic CAS functions:
From compare_set.h (file removed):
- compare_and_set_native()
- compare_and_set_extram()
From portmacro.h
- uxPortCompareSet()
- uxPortCompareSetExtram()
Users should call esp_cpu_compare_and_set() instead as this function hides the details
of atomic CAS on internal and external RAM addresses.
Due to the removal of compare_set.h, some missing header includes are also fixed in this commit.
This updates the minimal supported version of CMake to 3.16, which in turn enables us to use more CMake features and have a cleaner build system.
This is the version that provides most new features and also the one we use in our latest docker image for CI.
